Stone-working tool



Dec., 27, 1938. G, A, skwENsoN 1?;,14LL567 STONEFWORKING TOOL Filed May 1l, 1938 l n 73- .A

llllllll Patented Dec. 27, 1938 UNITED VSTATES PATENT OFFICE Gustave A. Swenson, Champaign, Ill. Application May 11, 1938, Serial No. 207,395

3 Claims.

This invention relates to improvements in stone-working appliances and, particularly, to

a stone-cutting tool.

One object of the invention is to minimize the time required to cut and finish off the surface of a design in or on the surface of a stone. More specifically, the invention contemplates the pro- Vision of a stone-cutting tool capable of cutting more deeply into a stone, or with which increased quantities may be cut from the surface of a stone inproducing a given design on the surface thereof without danger of chipping or -fracturing the stone to a point beyondthe line or depth to which it is intended to cut the stone in forming the desired design or pattern.

Another object of the invention is ,to minimize the time required in the several cutting and dressing or surface-finishing operations, such as rst roughing-out the sur-face for the design and then finishing olf both the out and uncut portions of the surface, by providing a tool assembly'consisting of the roughing-out tool and finishing tool or tools so that the nished stone can be produced without loss of timein substituting one tool for another.

A still further object of the invention is to provide a stone-working tool having one or more recesses in its cutting edge, the purpose of these recesses being to permit the tool to cut to a greater depth without fracturing the stone below design being cut in the stone. Preferably, the wall of each'recess in the cutting edge of the tool is also beveled to form a cutting edge thereon. With a tool of this character, the operator can cut more deeply into the stone withoutchipping the stone beyond the contemplated line of the pattern, by reason of the fact that the recessed cutting edge causes the stone chips to crumble or break up so that excessively llarge pieces are not removed Vfrom any one portion of the stone surface.

With these and other objects in View, the invention consists in certain details of construction and combinations and arrangements of parts, all as will hereinafter be more fully described and the novel features thereof particularly pointed out in the appended claims.

vIn the accompanying drawingrFigure 1 illustrates one form of the present tool assembly in front elevation, with the stone which is being operated upon shown in crosssection;

' Fig. 2 is a view, partly in elevation and partly in section, taken on the line 2-2 of Fig. 1;

or beyond the proposed finished surface of thev Fig. 3 is a similar View of a modied tool assembly;

Fig. 4 is a view taken on Fig. 3;

Fig. 5 is a perspective view illustrating one .5 form of roughing-out tool having the edge thereof recessed in accordance with Athe present invention; and

Fig. 6 is a detail top plan view of the cutting edge of the roughing-out tool illustrating the conl1o cave formation of said edge.

In the form of invent-ion illustrated in Figs.

l and 2, the tool assembly comprises tools of a form which would be used in producing a uted surface on the stone 20, but it will be appre- .15 ciated that lthe present invention may be incorporated in tools for cutting other designs in a stone. This particular so-called iiuting tool assembly consists of a roughing-out tool l0, a flute-finishing tool Il, and a second finishing tool i2, the purpose of the roughing-out tool beingl to remove or rough-out the greater portion of the material that must be cut away to form ythe groove or fiutewhile the nnte-finishing tool li smooths or iinishes off the surface o f the flute or groove and the nishing toolv l2 finishes off the surface of the stone between adjacent flutes. It will also be appreciated that the tool assembly may consist of one or more roughingout tools and flute-nishing tools.` For instance, Fig. 1 illustrates a stone 20 and an assembly consisting of three roughing-out tools which are referred to in the industry as gouges, it being understood that there is a flute-finishing tool Il behind' each gouge, as indicated by the dotted 35 lines in Fig. l. Where a plurality of gouges and flute-finishing tools are used in the assembly, the finishing tool l2 will be of a width suicient to nish off the plane surface of the stone between contiguous flutes as well as at the sides beyond 40 the end flutes in the series of flutes formed by the tool. The several tools are preferably but not necessarily rigidly locked or secured together in the assembly by bolts I3 and, in ordinary use, this assembled tool will be carried or clamped in a suitable stock for cooperation with the ordinary planer bed used in the stone-cutting industry. As previously indicated, each of the gouges or roughing-out tools lo has its concave cutting edge formed with one or more notches or recesses, the number of recesses varying with and being dependent upon the width or size of the tool, Wider tools naturally having a larger` number of recesses therein than a comparatively narrow tool. These recesses, indicated at I4, are

the line 4 4 of curved contour. It is also preferred that the wall of each recess be beveled to form an operative cutting edge on that wall. Where the beveled surface is provided on the Wall of the recess, the inclination of the bevel preferably corresponds to the inclination of the bevel on the cutting edge proper of the tool. With a notched or recessed cutting edge on the roughing-out tool, it has been found that the stone, in each operation or movement of the tool along the stone surface, can be cut to a greater depth without danger of the stone chipping or frac'- Vturing below the cutting line, so to speak, of the tool. In other words, where, the gouge or other roughing-out tool is set to cut` the stone along aV plane comparatively close to the contemplated nished surface orrline of the design,

the stone will not be chipped or broken below` interchangeablyand successively used in the toolV stock. For instance, instead of using a multiple tool assembly, the recessed gouge orY otherroughing-out tool may be used by itself and, after the roughing-out operation has been performed, theV roughng-out tool could be removed from the stock and replaced by a finishing tool, which would finish off the roughed-out surface. 'Of course, this would require a greater amount of time, as compared with the time required with the composite tool because with the latter no Y time is lost in substituting the finishing tool for the roughing-out tool in the tool stock. Y

Another form of assembly is illustrated in Figs.

V3 and '4, VinV which instance, thev flute-finishing Y tool Il is combined, so to speak, withY the planesurface finishing tool l2. In this form of assembly, there isionly the roughing-out tool l and a finishing tool I2a, the latter, in this instance,'ha'ving an operating orcutting edge corresponding to the combined surfaces of the utes formed by the roughing-out tools and theY plane 5o' surfaces'between and at the sides of the several iiutes formed by the roughin'g-out tool. In other words, where Athree gouges are used with the finishing tool lZa, the latter will have three semicircular portions l5 to nish oi'the surfaces of the three utes and straight-cutting edge porpreferably, but not necessarily, of arcuate' or tions I6 for finishing off the plane surfaces of the stone. In this form of assembly, the nishing tool I2a is also, made with a straight shank and a spacer block l'lris interposed between the nishing tool and gouge in order to provide ample clearance between the two tools to permit ready escape of stone chips from between the two tools. In actual practice, it-has been found that the Ypresent tool assembly greatly minimizes the time jj more which, ofcourse, is a tremendous saving.

This is due to the fact that no time is lost changing toolsrand the presence of the notches in the j cutting edge of the roughing-out tool. It might be added that these notches relieve considerable pressure and cause the spalls to shatter and hence permit the tools to cut deeper.

What I claim is: Y

1. A stone-working tool assembly comprising a roughing-out gouge having a recessed cutting edge with the wall of each recess beveled to form a cutting edge thereon, a finishing-nnte tool secured tothe gouge in 'tandem relation with respect to said gouge, and cutting means associated with said gouge and ute finishing tool for nishing the surface of aV stoneV between utes'cut therein by Said gouge. Y

2. A stone-'working tool assembly comprising the roughing-outgouge having ya recessed cuttingedge, the wallsV of said recesses also having YaV cutting edge provided thereon, said gouge being adapted to roughly'cut a flute in the surface of a stone, and a finishing tool rigidly secured to said gouge, said nishingV tool having a stone- Aworking edge conforming to the surface of the flute cut in the stone and the surface ofthe stone adjacent the two side extremities of the flute.

3. Astone-working tool assembly comprising'a roughinglout tool having a recessed cutting edge of a contour to roughly form the desired design on the surface of a stone, the wall of each recess Vbeing beveled toV` form a'cutting edge thereon, a

finishing tool secured to the roughing-'out tool jin tandem relation with respect to said roughingout tool,.said finishing tool havinga contour corresponding to the contour of the design to be formed on'the stone, andV cutting means lasso- Y ciated-with said roughing-out tool and finishing tool'for nishing'lthersurface of the stone at the side of the design formed on the surface of the stone by said roughing-out and finishing tools. c

GUs'rAvr-iV A. SWENSON. 

